To cite the geeM package in publications use:
McDaniel, L. S., Henderson, N. C., and Rathouz, P. J. (2013) Fast pure R implementation of GEE: application of the Matrix package The R Journal, 5/1:181--187
Corresponding BibTeX entry:
@Article{, author = {Lee S. McDaniel and Nicholas C. Henderson and Paul J. Rathouz}, title = {Fast pure {R} implementation of {GEE}: application of the {M}atrix package}, journal = {The {R} Journal}, year = {2013}, volume = {5}, issue = {1}, pages = {181--187}, url = {https://journal.r-project.org/archive/2013-1/mcdaniel-henderson-rathouz.pdf}, }